USRE46735EExpiredUtilityPatentIndex 62
Optical imaging system
Est. expiryJul 7, 2025(expired)· nominal 20-yr term from priority
G02B 9/36G02B 13/004G02B 9/34G02B 5/20G03B 30/00G02B 13/18
62
PatentIndex Score
1
Cited by
22
References
48
Claims
Abstract
An optical imaging system is provided comprising a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive or negative power; and a fourth lens group having a positive or negative power.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject; a second lens group closest to the first lens group and having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein each of the first to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof; and one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
2. An optical imaging system according to claim 1 , wherein the first lens group comprises at least one lens of a positive refractive power.
3. An optical imaging system according to claim 1 , wherein the second lens group comprises at least one lens of a negative refractive power.
4. An optical imaging system according to claim 1 , wherein the third lens group comprises at least one lens of a positive or negative refractive power.
5. An optical imaging system according to claim 1 , wherein a fourth lens group comprises at least one lens of a positive or negative refractive power.
6. An optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.3
<
f
1
f
<
3.1
,
wherein f denotes synthetic focus distance of the optical imaging system and f 1 denotes focus distance of the first lens group.
7. An optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.3
<
f
2
f
<
8.99
,
wherein f denotes a synthetic focus distance of the optical imaging system and f 2 denotes a focus distance of the second lens group.
8. An optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.19
<
f
3
f
<
∞
,
wherein f denotes a synthetic focus distance of the optical imaging system and f 3 denotes a focus distance of the third lens group.
9. An optical imaging system according to claim 1 , wherein the optical imaging system satisfies
0.15
<
f
4
f
<
∞
,
wherein f denotes a synthetic focus distance of the optical imaging system and f 4 denotes a focus distance of the second lens group.
10. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein the optical imaging system satisfies
0.45
<
f
TTL
<
1.01
,
wherein f denotes a synthetic focus distance of die optical imaging system and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
11. An optical imaging system according to claim 10 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
12. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein the first and second lens groups satisfy an optical axis direction size according to
0
<
d
1
TTL
<
0.26
,
wherein d 1 denotes a separated distance between the first lens group and the second lens group on the optical axis and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
13. An optical imaging system according to claim 12 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
14. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein the third and fourth lens groups satisfy an optical axis direction size according to
0
<
d
3
TTL
<
0.40
,
wherein d 3 denotes a separated distance between the third lens group and the fourth lens group on the optical axis and TIL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.
15. An optical imaging system according to claim 14 , further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.
16. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject; a second lens group closest to the first lens group and having a negative refractive power; a third lens group having one of a positive or negative power; and a fourth lens group having one of a positive or negative power, wherein each of the first to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof, and wherein the Abbe's numbers of the first and second lens groups G 1 and G 2 satisfy
28.2<ν1−ν2<42.8,
wherein ν 1 and ν 2 denote Abbe's numbers representing the distribution characteristics of the first and second lens groups respectively.
17. An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens having a positive refractive power closest to an object; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power, wherein the first lens has both surfaces aspheric and each of the second to fourth lenses comprises an aspheric lens having at least one aspheric surface thereof; and a thin film for restricting the transmission of a portion of light between the third and fourth lenses, wherein the first lens has an object side surface having a positive curvature, and the second lens has an image side surface having a positive curvature, and the third lens has an object side surface having a negative curvature and an image side surface having a negative curvature.
18. The optical imaging system according to claim 17, wherein the optical imaging system satisfies
0.3
<
f
2
f
<
3.1
,
wherein f denotes a total focal length of the optical imaging system and f 1 denotes a focal length of the first lens.
19. The optical imaging system according to claim 17, wherein the optical imaging system satisfies
0.3
<
f
2
f
<
8.99
,
wherein f denotes a total focal length of the optical imaging system and f 2 denotes a focal length of the second lens.
20. The optical imaging system according to claim 17, wherein the optical imaging system satisfies
0.19
<
f
3
f
<
∞
,
wherein f denotes a total focal length of the optical imaging system and f 3 denotes a focal length of the third lens.
21. The optical imaging system according to claim 17, wherein the optical imaging system satisfies
0.15
<
f
4
f
<
∞
,
wherein f denotes a total focal length of the optical imaging system and f 4 denotes a focal length of the fourth lens.
22. The optical imaging system according to claim 17,
wherein the optical imaging system satisfies
0.45
<
f
TTL
<
1.01
,
wherein f denotes a total focal length of the optical imaging system and TTL denotes a distance from an iris surface to an imaging surface.
23. The optical imaging system according to claim 22, further comprising a parallel flat glass disposed between the image sensor and the fourth lens.
24. The optical imaging system according to claim 17, wherein the first and second lenses satisfy an optical axis direction size according to
0
<
d
1
TTL
<
0.26
,
wherein d 1 denotes a separated distance between the first lens and the second lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
25. The optical imaging system according to claim 24, further comprising a parallel flat glass disposed between the image sensor and the fourth lens.
26. The optical imaging system according to claim 17, wherein the third and fourth lenses satisfy an optical axis direction size according to
0
<
d
3
TTL
<
0.40
,
wherein d 3 denotes a separated distance between the third lens and the fourth lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
27. The optical imaging system according to claim 26, further comprising a parallel flat glass disposed between the image sensor and the fourth lens.
28. The optical imaging system according to claim 17, wherein the fourth lens comprises an aspheric lens having both surfaces aspheric.
29. The optical imaging system according to claim 17, further comprising an iris disposed at an object side of the first lens.
30. The optical imaging system according to claim 17, wherein the fourth lens comprises an image side surface having a positive curvature.
31. The optical imaging system according to claim 30, wherein a sign of curvature is changed when the image side surface of the fourth lens is distant from an optical axis.
32. The optical imaging system according to claim 17, wherein a sign of a curvature is changed when an image side surface of a fourth lens is distant from an optical axis.
33. The optical imaging system according to claim 17, further comprising a thin film for restricting the transmission of a portion of light between the second and third lenses.
34. The optical imaging system according to claim 17, wherein the optical imaging system satisfies the following equation:
28.2<ν1−ν2<42.8,
wherein ν1 and ν2 denote Abbe's numbers of the first lens and the second lens, respectively.
35. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0.3
<
f
1
f
<
3.1
,
wherein f denotes a total focal length of the optical imaging system, and f 1 denotes a focal length of the first lens.
36. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0.3
<
f
2
f
<
8.99
,
wherein f denotes a total focal length of the optical imaging system, and f 2 denotes a focal length of the second lens.
37. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0.19
<
f
3
f
<
∞
,
wherein f denotes a total focal length of the optical imaging system, and f 3 denotes a focal length of the third lens.
38. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0.15
<
f
4
f
<
∞
,
wherein f denotes a total focal length of the optical imaging system, and f 4 denotes a focal length of the fourth lens.
39. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0.45
<
f
TTL
<
1.01
,
wherein f denotes a total focal length of the optical imaging system and TTL denotes a distance from an iris surface to an imaging surface.
40. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0
<
d
1
TTL
<
0.26
,
wherein d 1 denotes a separated distance between the first lens and the second lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
41. The optical imaging system according to claim 34, wherein the optical imaging system satisfies the following equation:
0
<
d
3
TTL
<
0.40
,
wherein d 3 denotes a separated distance between the third lens and the fourth lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
42. The optical imaging system according to claim 18, wherein the optical imaging system satisfies the following equation:
0.3
<
f
2
f
<
8.99
,
0.19
<
f
3
f
<
∞
,
0.15
<
f
4
f
<
∞
,
wherein f denotes a total focal length of the optical imaging system, f 2 denotes a focal length of the second lens, f 3 denotes a focal length of the third lens, and f 4 denotes a focal length of the fourth lens.
43. The optical imaging system according to claim 42, wherein the optical imaging system satisfies the following equation:
28.2<ν1−ν2<42.8,
wherein ν1 and ν2 denote Abbe's numbers of the first lens and the second lens, respectively.
44. The optical imaging system according to claim 17, wherein the optical imaging system satisfies the following equation:
0.45
<
f
TTL
<
1.01
,
wherein f denotes a total focal length of the optical imaging system and TTL denotes a distance from an iris surface to an imaging surface.
45. The optical imaging system according to claim 44, wherein the optical imaging system satisfies the following equation:
0
<
d
1
TTL
<
0.26
,
wherein d 1 denotes a separated distance between the first lens and the second lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
46. The optical imaging system according to claim 45, wherein the optical imaging system satisfies the following equation:
28.2<ν1−ν2<42.8,
wherein ν1 and ν2 denote Abbe's numbers of the first lens and the second lens, respectively.
47. The optical imaging system according to claim 44, wherein the optical imaging system satisfies the following equation:
0
<
d
3
TTL
<
0.40
,
wherein d 3 denotes a separated distance between the third lens and the fourth lens on the optical axis and TTL denotes a distance from an iris surface to an imaging surface.
48. The optical imaging system according to claim 47, wherein the optical imaging system satisfies the following equation:
28.2<ν1−ν2<42.8,
wherein ν1 and ν2 denote Abbe's numbers of the first lens and the second lens, respectively.Cited by (0)
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